Question 1

Which of the following best describes microbial antagonism in the context of human health?

Accepted Answer

The process by which beneficial microbes outcompete pathogens for resources, preventing infection.

Question 2

Which white blood cell is primarily responsible for releasing histamine during allergic reactions, and what is its main function?

Accepted Answer

Basophil; mediates inflammation by releasing histamine.

Question 3

During the classical pathway of the complement cascade, which molecule initiates the cascade upon binding to antigen-antibody complexes?

Accepted Answer

C1

Question 4

A patient is exposed to a viral infection. Which interferons are produced in response, and what is their primary effect on neighboring cells?

Accepted Answer

Alpha and beta interferons; induce antiviral states by upregulating genes that inhibit viral replication.

Question 5

Which of the following best describes opsonization?

Accepted Answer

The process by which pathogens are coated with molecules (such as antibodies or complement proteins) to enhance phagocytosis.

Question 6

Eosinophilia is most likely to be observed in which clinical scenario?

Accepted Answer

A patient with a parasitic worm infection.

Question 7

Which of the following statements about MHC molecules is correct?

Accepted Answer

MHC I is found on all nucleated cells and presents endogenous antigens to cytotoxic T cells.

Question 8

Which immunoglobulin is produced first during a primary immune response, and which is predominant during a secondary response?

Accepted Answer

IgM is produced first; IgG predominates in secondary response.

Question 9

A patient receives a vaccine containing inactivated (killed) pathogens. Which statement best describes the advantages and disadvantages of this vaccine type?

Accepted Answer

It is safer than attenuated vaccines but may require booster shots due to weaker immune response.

Question 10

Which of the following best describes the mechanism of a Type I hypersensitivity reaction?

Accepted Answer

IgE binds to mast cells, leading to degranulation and release of histamine upon exposure to allergen.

Question 11

Which of the following equations best represents the rate of antibody production during a secondary immune response compared to a primary response?

Accepted Answer

$$R_{secondary} \gg R_{primary}$$

Question 12

A patient is diagnosed with HIV. Which enzyme is responsible for integrating the viral genome into the host DNA, and what is the equation for this process?

Accepted Answer

Integrase; $$	ext{Viral DNA} + 	ext{Host DNA} \xrightarrow{	ext{Integrase}} 	ext{Integrated DNA}$$

Question 13

Which of the following best describes the process of clonal deletion in the prevention of autoimmunity?

Accepted Answer

Self-reactive lymphocytes are eliminated during development to prevent immune responses against autoantigens.

Question 14

Which of the following is NOT a granulocyte?

Accepted Answer

Monocyte

Question 15

A patient receives a xenograft. Which statement best describes this type of transplant?

Accepted Answer

A tissue graft from a different species.

Question 16

Which of the following best describes the sequence of events in phagocytosis?

Accepted Answer

Chemotaxis, adherence, ingestion, digestion, exocytosis.

Question 17

Which of the following best explains why hemolytic disease of the newborn occurs?

Accepted Answer

Maternal IgG antibodies cross the placenta and attack fetal red blood cells with incompatible Rh antigen.

Question 18

Which of the following is a correct comparison between primary and acquired immunodeficiencies?

Accepted Answer

Primary immunodeficiencies are genetic, while acquired immunodeficiencies result from external factors such as infections or drugs.

Question 19

During an ELISA test, which of the following best describes the detection mechanism?

Accepted Answer

An enzyme-linked antibody binds to the target antigen, and a substrate is added to produce a color change.

Question 20

Which of the following equations best represents the effect of HAART/ART therapy on HIV viral load over time?

Accepted Answer

$$V_{treatment} \rightarrow 0$$

Innate and Adaptive Immunity, Vaccination, and Immune Disorders: Study Guide (Ch. 15-18)

Study Guide - Practice Questions

Study Guide - Flashcards